Stability of a generalized trigonometric
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Janyarak Tongsomporn; Vichian Laohakosol; Charinthip Hengkrawit; Patanee Udomkav
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Article
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2010
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Elsevier Science
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English
⚖ 308 KB
The stability of the functional equation F (x + y) -G(xy) = 2H (x)K(y) over the domain of an abelian group G and the range of the complex field is investigated. Several related results extending a number of previously known ones, such as the ones dealing with the sine functional equation, the d'Alem